Chrome: If you want Gmail or other webmail service provider to be your default email client when you click on email links on a webpage, this handy extension is one of the simplest ways to set up that default action.

We've previously noted a Windows app to make webmail providers the default email client, and you could also use Gmail notifier to make Gmail the default on both Mac and Windows. But the Mailto: extension is really the simplest to use: click to install, then select from one of the five webmail services—Fastmail, Gmail, Hotmail/Windows Live Mail, Yahoo mail, or Zoho mail. You can later switch the option in the extension settings.